Beyond Government Accountability: a challenging look at Peacekeepers by Matt Armstrong, 8 April 2008, at Serviam Magazine (magazine website no longer available).
The relationship between peacekeeping forces (PKFs) and the U.N. Security Council mimics the relationship between a private military or security company and the country in question. The Security Council negotiates with U.N. members to contribute to PKOs, most often in the stead of the five permanent Security Council members who actually make the decision to deploy military observers, police, and troops. The General Assembly does not authorize or oversee PKFs, but it is tasked to operate on the behalf of the Security Council.
Forgotten is Article 43 of the U.N. Charter, which calls for maintaining a standing rapid reaction military force to be available to the Security Council. Instead, the U.N. relies on ad hoc partnerships and "conditional commitments" through the U.N. Stand-By Arrangements System. This system falls well short of what was envisioned when it was established six decades ago at the dawn of the Cold War.